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CMOS scaling beyond the 100-nm node with silicon-dioxide-based gate dielectrics

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5 Author(s)
Wu, E.Y. ; IBM Microelectronics Division, 1000 River Road, Essex Junction, Vermont 05452, USA ; Nowak, E.J. ; Vayshenker, A. ; Lai, W.L.
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The limitations of reliability of silicon dioxide dielectric for future CMOS scaling are investigated. Several critical aspects are examined, and new experimental results are used to form an empirical approach to a theoretical framework upon which the data is interpreted. Experimental data over a wide range of oxide thickness (TOX), voltage, and temperature were gathered using structures with a wide range of gate-oxide areas, and over very long stress times. This work resolves seemingly contradictory observations regarding the temperature dependence of oxide breakdown. On the basis of these results, a unified, global picture of oxide breakdown is constructed, and the resulting model is applied to project reliability limits for the wear-out of silicon dioxide. It is concluded that silicon-dioxide-based materials can provide a reliable gate dielectric, even to a thickness of 1 nm, and that CMOS scaling may well be viable to the 50-nm-technology node using silicon-dioxide-based gate insulat ors.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:46 ,  Issue: 2.3 )

Date of Publication:

March 2002

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